Re: [APML] RE:FS102 and my wife,,,grin

[George Anderson <georgea@cam.org>]

John
If you are using a 2" focuser and a T-adapter have a look at the adapter
and see if the internal diameter is less than 1.75 inches. It most
likely is (I believe that the T-thread is 42mm). See if the T thread
portion is secured to the bayonet portion by three small set screws. If
it is you can reduce the vignetting slightly by getting a small lenth of
2"OD aluminum pipe. Loosen the three set screws and remove the threaded
portion, use a micrometer or caliper to measure the diameter, turn the
2" stock down (you have a mill so I am guessing that you have a lathe)
to that diameter and then cut a small v groove to accept the set screws.
Then cut it off to about the same length as a 2" EP barrel.

George Anderson
Montreal Canada

Clear skies and good health


Gene Horr wrote:
         <Text edited>
> No.  The problem with the 2" adapters and the t-mount is that
> they "stop down" the opening, resulting in vignetting.  The
> widemount design attempts to minimize this effect.
> 
> Your 2" adapter will work, just if you get some vignetting
> on the edges don't blame the optics <g>.
> Gene Horr
> genehorr@houston.rr.com
> 
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